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COMPACT MICROSTRIP LOWPASS FILTER WITH AN ULTRA-WIDE STOPBAND AND SHARP TRANSITION BAND USING T-SHAPED AND POLYGON RESONATORS

By A. Abdipour and A. Abdipour

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Abstract:
In this paper, a lowpass filter with -3 dB cutoff frequency of 5.3 GHz using T-shaped and polygon resonators is presented. The applied resonators create a sharp transition band of 0.2 GHz from -3 dB to -40 dB. To obtain an ultra-wide stopband about 54 GHz (10.18fc) with a suppressing level of -21 dB, two different suppressing cells are employed. The overall circuit size is 59.16 mm2, which indicates a small occupied area. To clarify the performance of each resonator and describe the location of the transition zeros, exact equations based on the equivalent LC circuits have been calculated.

Citation:
A. Abdipour and A. Abdipour, "Compact Microstrip Lowpass Filter with an Ultra-Wide Stopband and Sharp Transition Band Using T-Shaped and Polygon Resonators," Progress In Electromagnetics Research C, Vol. 74, 51-61, 2017.
doi:10.2528/PIERC16121904

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